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Re: Lambda Lambdabar simulations [message #16331 is a reply to message #16318] Wed, 16 April 2014 10:30 Go to previous messageGo to previous message
donghee is currently offline  donghee
Messages: 385
Registered: January 2009
Location: Germnay
first-grade participant
From: *kph.uni-mainz.de
Hi,

The lambda-lambdabar data has been tested with phase space mode and in addition a special detector has been introduced to see acceptance behaviour of anti-lambda as you suggested.
Quote:

fastSim->AddDetector("ScSttAlone", "thtMin=0. thtMax=160. ptmin=0.0 pmin=0.0 pRes=0.01 thtRes=0.001 phiRes=0.001 efficiency=1.0");

Efficieny increase clearly, since the reconstructed distribution is not scaled any more.
But still acceptance is going down at cos(theta) = -1 and 1.

I think that the pure acceptance can be understood with a V0 decay. If the lambda or lambdabar decay far from the target region, daughter tracks could not be reconstructed. It leads to drop down of acceptance because forward boosted lambdabar(or lambda) flight a long distance.
As far as I understand, all track candidates defined in the fast simulation are coming closely from target region.

index.php?t=getfile&id=7812&private=0

Best wishes,
Donghee
 
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